Rat embryonic ectoderm as renal isograft

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Abstract
Experimental results obtained many years ago revealed that during gastrulation (with the primitive streak and the mesoderm formation as distinct features) the early rodent embryo undergoes essential changes in its response to extrinsic teratogens (Russell & Russell, 1954; Wilson, 1954; Škreb, 1961; Škreb & Bijelic, 1962; Škreb & Frank, 1963). It has also been shown that the ultrastructural, histochemical and biosynthetic features of the embryo are subject to substantial changes during this period (Solter, Damjanov & Škreb, 1970, 1973; Dziadek & Adamson, 1978; Bode & Dziadek, 1979; Wartiovaara, Leivo & Vaheri, 1979; Jackson et al. 1981; Franke et al. 1982a, b). This suggests a restriction of developmental capacities (i.e. the loss of the capacity of regulation) in groups of embryonic cells at this developmental stage.